当统计时，四舍五入超过100%，怎么处理

最新推荐文章于 2024-09-03 19:27:07 发布

原创最新推荐文章于 2024-09-03 19:27:07 发布 · 2.5k 阅读

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#java #算法

该博客介绍了如何在Java中实现一个算法，当一组数据的占比总和超过1时，通过调整最大值使其总和保持为1。示例代码展示了如何遍历列表，找到最大值并减去超出部分，从而达到平衡比例的目的。

比如，0.15+0.7+0.16=1.01，超出1，将最大的那个数字减去0.01，变成1。

这里将0.7-0.01=0.69，0.15+0.69+0.16=1

[

{"rate":"0.15","sceneName":"乘地铁"},

{"rate":"0.7","sceneName":"乘公交"},

{"rate":"0.16","sceneName":"步行"}

]

public class CarbonCensus {

    //场景名
    private String sceneName;
    //占比
    private String rate;
}

public class Test {

    public static void main(String[] args) {

        List<CarbonCensus> carbonCensusList = new ArrayList<>();
        CarbonCensus carbonCensus = new CarbonCensus();
        carbonCensus.setSceneName("乘地铁");
        carbonCensus.setRate("0.15");
        carbonCensusList.add(carbonCensus);

        carbonCensus = new CarbonCensus();
        carbonCensus.setRate("0.7");
        carbonCensus.setSceneName("乘公交");
        carbonCensusList.add(carbonCensus);

        carbonCensus = new CarbonCensus();
        carbonCensus.setRate("0.16");
        carbonCensus.setSceneName("步行");
        carbonCensusList.add(carbonCensus);

        if (CollectionUtil.isEmpty(carbonCensusList)) {
            return;
        }
        //合计
        BigDecimal bigDecimal = new BigDecimal(0);
        for(int i=0; i<carbonCensusList.size(); i++) {
            bigDecimal = bigDecimal.add(new BigDecimal(carbonCensusList.get(i).getRate()));
        }
        double rate = bigDecimal.doubleValue();
        if(rate == 1) {
            return;
        }
        if(rate > 1) {
            //需要减的次数，比如rate=1.02，就是减2次
            int minusCount = (int)(rate * 100 - 100);

            for (int i=0; i<minusCount; i++) {
                Optional<CarbonCensus> optional = carbonCensusList.stream().max(((o1, o2) ->
                        (int)(Double.parseDouble(o1.getRate())*100) - (int)(Double.parseDouble(o2.getRate())*100)));
                if(optional.isPresent()) {
                    CarbonInfoResp.CarbonCensus item = optional.get();
                    item.setRate(new BigDecimal(item.getRate()).subtract(new BigDecimal("0.01")).toString());
                }
            }
        } else if(rate < 1) {
            //需要加的次数，比如rate=0.98，就是加2次
            int addCount = (int)(100 - rate * 100);

            for (int i = 0; i< addCount; i++) {
                Optional<CarbonCensus> optional = carbonCensusList.stream().min(((o1, o2) ->
                        (int)(Double.parseDouble(o2.getRate())*100) - (int)(Double.parseDouble(o1.getRate())*100)));
                if(optional.isPresent()) {
                    CarbonInfoResp.CarbonCensus item = optional.get();
                    item.setRate(new BigDecimal(item.getRate()).add(new BigDecimal("0.01")).toString());
                }
            }
        }

        System.out.println(JSON.toJSONString(carbonCensusList));
        //[{"rate":"0.15","sceneName":"乘地铁"},{"rate":"0.69","sceneName":"乘公交"},{"rate":"0.16","sceneName":"步行"}]


    }


}